Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
su triet » su viet, su tien, ve triet
hang dai » hoang dai, hang tai, hang dau
dai hoi » dai hoc, dai hai, dai moi
sach ly » sach lo, sach ty, sach hay
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ly) or (sach y)) hang dai hoi. ((hieu viec) OR (nhieu viec)) cac tuc xa hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach y)) hang dai hoi. ((hieu viec) OR (nhieu viec)) cac tuc xa hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ly) or (sach y)) hang dai hoi. ((hieu viec) OR (nhieu viec)) cac tuc xa hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach y)) hang dai hoi. ((hieu viec) OR (nhieu viec)) cac tuc xa hanh vi su triet*.